KR0162384B1 - Induction heating cooker - Google Patents
Induction heating cooker Download PDFInfo
- Publication number
- KR0162384B1 KR0162384B1 KR1019950024115A KR19950024115A KR0162384B1 KR 0162384 B1 KR0162384 B1 KR 0162384B1 KR 1019950024115 A KR1019950024115 A KR 1019950024115A KR 19950024115 A KR19950024115 A KR 19950024115A KR 0162384 B1 KR0162384 B1 KR 0162384B1
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- KR
- South Korea
- Prior art keywords
- magnetic flux
- induction heating
- heating cooker
- magnetic
- shielding device
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1254—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements using conductive pieces to direct the induced magnetic field
Abstract
본 발명의 유도가열조리기는, 조리용기 바닥면과 워킹코일 사이에 자로를 형성하여 자속의 누설을 방지하는 자속차폐장치를 설치함으로써 비자성 금속용기의 사용시 가열효율의 저하없이 워킹코일과 조리용기 바닥간의 간격을 6㎜ 이상으로 현실화 시킬 수 있으며, 불필요한 자속의 누설을 차폐하여 EMI 잡음등을 감소시킴으로써 제품의 신뢰성을 향상시킬 수 있는 효과가 있다.Induction heating cooker of the present invention, by installing a magnetic shield between the cooking vessel bottom and the working coil to prevent the leakage of magnetic flux by installing a magnetic flux shielding device without using the working coil and cooking vessel bottom without deteriorating the heating efficiency The gap between the two can be realized more than 6mm, and by reducing the EMI noise by shielding the leakage of unnecessary magnetic flux, there is an effect that can improve the reliability of the product.
Description
제1도는 일반적인 유도가열조리기의 원리도.1 is a principle diagram of a general induction cooker.
제2도는 알루미늄 조리용기와 가열코일간의 간격별 가열효율 특성을 도시한 그래프.2 is a graph showing the heating efficiency characteristics according to the interval between the aluminum cooking vessel and the heating coil.
제3도는 일반적인 유도가열조리기의 등가회로도.3 is an equivalent circuit diagram of a typical induction cooker.
제4도는 본 발명에 의한 유도가열조리기의 자속차폐장치의 일실시예를 도시한 구조도.Figure 4 is a structural diagram showing an embodiment of the magnetic flux shielding device of the induction heating cooker according to the present invention.
제5도는 본 발명에 의한 유도가열조리기의 자속차폐장치의 다른 실시예를 도시한 구조도.Figure 5 is a structural diagram showing another embodiment of the magnetic flux shielding device of the induction heating cooker according to the present invention.
제6도는 본 발명에 의한 유도가열조리기의 자속차폐장치의 또다른 실시예를 도시한 구조도.Figure 6 is a structural diagram showing another embodiment of the magnetic flux shielding device of the induction heating cooker according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : 조리용기바닥면 12 : 자속11: bottom of cooking vessel 12: magnetic flux
13,13',13'' : 자속차폐장치 14 : 워킹코일13,13 ', 13' ': Magnetic flux shielding device 14: Working coil
본 발명은 유도가열조리기에 관한 것으로, 특히 비자성 금속용기등의 유도가열조리시 가열 코일과 조리용기바닥간의 간격 증가에 따른 가열효율 저하를 방지하기 위한 유도가열조리기에 관한 것이다.The present invention relates to an induction heating cooker, and more particularly, to an induction heating cooker for preventing a decrease in heating efficiency due to an increase in the distance between the heating coil and the bottom of the cooking vessel during induction heating cooking such as a non-magnetic metal container.
유도가열(induction heating)은, 코일에 흐르는 유도전류의 표피효과(skin effect)를 이용하여 에너지 효율을 극대화시키는 조리방법으로서, 제1도에 도시한 바와 같이 종리용기의 바닥에 워킹코일(3)로부터 발생된 고주파 교류자장을 결합시켜 유기된 와전류를 상기 조리용기의 저항률과 투자율등과 같은 구성물질특성에 따라 주울열로 변환시켜 발열함으로써 담겨지는 음식물을 조리하도록 하는 것이다.Induction heating is a cooking method for maximizing energy efficiency by using the skin effect of an induction current flowing through a coil, and as shown in FIG. 1, the working coil 3 at the bottom of the bell jar. By combining the high frequency alternating magnetic field generated from the eddy current is converted to Joule heat according to the constituent properties such as resistivity and permeability of the cooking vessel to heat the food to be contained by cooking.
이때 상기 조리용기의 바닥면과 가열코일간에는 일정간격 이격되도록 하여 열을 식히기 위해 통풍을 해주는데, 자성체용기의 경우에는 6㎜~10㎜ 정도 이격되어도 상기 자성체 용기가 가진 흡입력으로 인해 별다른 문제가 발생하지 않지만, 비자성체 용기와 같은 저효율용기는 간격이 클수록 자속(flux)의 누설이 심해져 가열효율이 크게 저하된다.At this time, the bottom surface of the cooking container and the heating coil is spaced at a predetermined interval to ventilate to cool the heat. In the case of the magnetic container, even if spaced apart by about 6 ~ 10㎜ does not cause any problems due to the suction force of the magnetic container. However, low-efficiency containers, such as nonmagnetic containers, have a greater leakage of flux due to larger intervals, which greatly reduces heating efficiency.
이를 좀 더 구체적으로 설명하면, 철은 저항률(ρ)이 9.5×10-7Ωm이고, 비투자율(μ)이 100이며, 이에 비해, 알루미늄은 저항률이 2.5×10-7Ωm이고, 비투자율이 1로서 가열시 발열전력(P = K(Ni)2√μρω)이 코일의 턴수와, 비투자율, 저항율 및 주파수에 의한 것임을 고려할때, 워킹호일의 턴수와 1차전류등의 동작조건이 동일하다고 가정하는 경우, 비자성금속의 투자율과 저항률이 자성체에 비해 저항률에는 약3배이상, 비투자율에서는 100배가 적어 전체 발열전력면에서 1/20 수준에 불과함을 알 수 있으며, 구리로 구성된 워킹코일의 손실량이 조리용기의 가열전력에 비해 상대적으로 크며, 또한 상기와 같이 투자율이 1인 경우는 공기의 투자율과 동일하여 자속을 조리용기 바닥으로 집속시키지 못하기 때문에 공기흐름등을 고려한 6㎜ 이상의 현실적인 간격설계가 불가능하다.More specifically, iron has a resistivity (ρ) of 9.5 × 10 −7 Ωm, specific permeability (μ) of 100, whereas aluminum has a resistivity of 2.5 × 10 −7 Ωm and a specific permeability. Considering that the heating power (P = K (Ni) 2 √μρω) is 1 due to the number of turns of the coil, relative permeability, resistivity and frequency, the operating conditions such as the number of turns of the working foil and the primary current are the same. Assuming that the magnetic permeability and resistivity of the nonmagnetic metal is about three times higher than that of the magnetic material and less than 100 times lower than the non-permeability, it is only 1/20 of the total heating power. When the loss amount is relatively large compared to the heating power of the cooking vessel, and the permeability is 1 as described above, the magnetic permeability is the same as the permeability of the air, so that the magnetic flux cannot be focused on the bottom of the cooking vessel, and thus a realistic gap of 6 mm or more considering the airflow doxy It is impossible.
즉, 제2도에 도시한 바와 같이 대표적인 비자성 용기인 알루미늄의 경우에는 a도의 0.5㎜와 b도의 3.0㎜일때가 효율이 5% 이상 차이가 나는 것을 볼 수 있다. 또한, 제3도에 도시한 바와 같은 등가회로를 이용하여 워킹코일과의 간격을 저항 RGap으로 하여 에너지 이용효율을 구해보면 손실정도를 다음과 같이 표시할 수 있다.That is, as shown in FIG. 2, in the case of aluminum, which is a representative nonmagnetic container, the efficiency differs by 5% or more when 0.5 mm of a degree and 3.0 mm of b degree are used. In addition, if the energy use efficiency is obtained by using the equivalent circuit as shown in FIG. 3 as the distance between the working coil as the resistance R Gap , the degree of loss can be expressed as follows.
먼저 조리용기를 a도의 상단과 같이 코일 Lx(x는 코일 턴수)과, 저항 R2로 나타내고, 워킹코일과의 간격을 저항 RGap으로 고려하는 경우 b도와 같이 코일 L'과, 직렬연결된 저항 R1, RGap, R2'으로 표현할 수 있으며, 이때 L'(L'={L1-[(ω2K2L1τ2)/(1+ω2τ2)]} 값은 용기에 의한 인덕턴스 변화분이고, R2'(R2=ω2K2L1τ2/(1+ω2τ2))의 값은 용기에 의한 저항성분이므로, 전체손실분에 대한 용기의 손실분인 효율(η=R2'/(R1+R2'+RGap))을 구할 수 있는데, 상기 워킹코일과의 간격에 따른 저항 RGap이 조리용기와 워킹코일간의 간격이 넓어질수록 급속이 증가되는 점을 고려할때 상기 효율도 저하되는 것을 알 수 있다.First coil, such as the top of a cooking vessel a degree Lx (x is the coil number of turns) and, represents a resistance R2, the working case to consider the distance between the coil resistance R Gap coil as help b L 'and a series-connected resistor R1, R Gap , R2 ', where L' (L '= {L1-[(ω 2 K 2 L1τ 2 ) / (1 + ω 2 τ 2 )]} is the change in inductance caused by the container, and R2 Since the value of '(R2 = ω 2 K 2 L1τ 2 / (1 + ω 2 τ 2 )) is the resistance component by the container, the efficiency (η = R2' / (R1 + R2 ') is the loss of the container relative to the total loss. + R Gap )), which can be seen that the efficiency is lowered considering that the resistance R Gap according to the interval between the working coil increases rapidly as the interval between the cooking vessel and the working coil increases. .
이처럼 종래의 유도가열조리기는, 비자성 용기 사용시 워킹코일과 조리용기 바닥간의 간격이 멀어질수록 자속이 누설되어 EMI 잡음이 증가하며, 가열효율이 급격히 떨어지는 문제점이 있다.As described above, the conventional induction heating cooker has a problem in that magnetic flux leaks as the gap between the working coil and the bottom of the cooking container increases, and EMI noise increases, and the heating efficiency drops sharply.
따라서, 본 발명의 목적은 상기와 같은 문제점을 해결하기 위하여 자속의 누설을 방지할 수 있는 유도가열조리기를 제공하는 것이다.Accordingly, an object of the present invention is to provide an induction heating cooker which can prevent the leakage of magnetic flux in order to solve the above problems.
상기 목적을 달성하기 위한 본 발명의 유도가열조리기는, 조리용기 바닥면과 워킹코일 사이에 자료를 형성하여 자속의 누설을 방지하는 자속차폐장치를 포함하여 구성된 것을 특징으로 한다.Induction heating cooker of the present invention for achieving the above object is characterized in that it comprises a magnetic flux shielding device to prevent the leakage of magnetic flux by forming a material between the cooking vessel bottom surface and the working coil.
이하, 첨부도면을 참조하여 본 발명을 좀 더 상세하게 설명하고자 한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
본 발명의 유도가열조리기는, 제4도에 도시한 바와 같이 워킹코일(14)의 외측면에서 조리용기바닥면(11)과 워킹코일(14) 사이에 고주파 손실이 적고, 투자율이 좋으며, 온도 의존성이 적은 페라이트나 비정질 금속을 사용하여 자속차폐장치(13)를 설치함으로써 자로를 형성하여 불필요한 자속의 누설을 방지한다. 이때 상기 자속차폐장치(13) 제4도에 도시한 바와 같이 실린더형으로 형성하거나, 제5도 및 제6도에 도시한 바와 같이 워킹코일(14)과의 접촉부가 안측으로 굽은 L자형의 다수개의 막대만으로 형성하거나 또는 상기 워킹코일(14)의 중앙에 원구모향의 수직형 자성체 막대가 더 포함되도록 형성하며, 특히 페라이트의 경우는 원가가 높지 않기 때문에 사용시 제품의 가격경쟁력면에서도 유리하다.As shown in FIG. 4, the induction heating cooker of the present invention has a low frequency loss between the cooking vessel bottom 11 and the working coil 14 at the outer side of the working coil 14, has a good permeability, and has a temperature. By installing the magnetic flux shield device 13 using ferrite or amorphous metal with less dependence, a magnetic path is formed to prevent unnecessary leakage of magnetic flux. At this time, the magnetic flux shield device 13 is formed in a cylindrical shape as shown in FIG. 4, or as shown in FIGS. 5 and 6, the contact portion with the working coil 14 is bent inwards. It is formed of only four rods or formed in the center of the working coil 14 to further include a vertical magnetic rod of the sphere-shaped in the center, especially in the case of ferrite is advantageous in terms of price competitiveness of the product in use because it is not high.
이상에서와 같이 본 발명에 의하면, 비자성 금속용기의 사용시 가열효율의 저하없이 워킹코일과 조리용기 바닥간의 간격을 6㎜ 이상으로 현실화 시킬 수 있으며, 불필요한 자속의 누설을 차폐하여 EMI 잡음등을 감소시킴으로써 제품의 신뢰성을 향상시킬 수 있는 효과가 있다.As described above, according to the present invention, it is possible to realize the gap between the working coil and the bottom of the cooking vessel to 6 mm or more without reducing the heating efficiency when using the nonmagnetic metal container, and to reduce the EMI noise by shielding the leakage of unnecessary magnetic flux. By doing so, there is an effect of improving the reliability of the product.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950024115A KR0162384B1 (en) | 1995-08-04 | 1995-08-04 | Induction heating cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950024115A KR0162384B1 (en) | 1995-08-04 | 1995-08-04 | Induction heating cooker |
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| Publication Number | Publication Date |
|---|---|
| KR970014461A KR970014461A (en) | 1997-03-29 |
| KR0162384B1 true KR0162384B1 (en) | 1999-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950024115A KR0162384B1 (en) | 1995-08-04 | 1995-08-04 | Induction heating cooker |
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| KR (1) | KR0162384B1 (en) |
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1995
- 1995-08-04 KR KR1019950024115A patent/KR0162384B1/en not_active IP Right Cessation
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| KR970014461A (en) | 1997-03-29 |
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